This is a rare long sleeve T-shirt promoting the Short Movie for the Coca Cola Polar Bears which was released in 2012. It's very unique in that it shows the bears and has all their names on it! (I didn't know they all had names) It's two sided also.  It's a size Men's XL, but it fits like between a L and an XL:
                           pit to pit- 23''
                           sleeves- 25''
                           length in back- 28''
It's made of cotton so it will stretch back out a bit when it's worn. Very cool collector's item!